Free: Contests & Raffles.
I think its a waste of money, just like scent lock clothing and several other gimics. Thats coming from a guy that sees an average of 100 whitetail bucks or more everyfall for the last 20+ years. Just an opinion though. It won't hurt other than money loss and the possibility of scaring an animal I suppose. The only scent I absolutely discouraged was some guy that was going to put moose in heat on himself as a coverscent.
Here's a link with some information about whitetail breeding activities. I'm not posting this up here to say everything in it is right/wrong, just posting it because I'm sure some people might find the info interesting, or learn something they didn't know. http://www.trmichels.com/RutDates.htm